Zoltan....
it sounds like you may have defined the 3590 device class with
DEVTYPE=CARTRIDGE.  You need to define the DEVTYPE=3590 for this
devclass.  The 3590 support on ADSM/MVS came out in ptf 10, so
it's not documented in the manuals...if you are prior to pft 10 service
level, I would suggest applying the latest ptf (12)...check the online
help (HELP DEFINE DEVCLASS) for details...greg tevis

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We just attached our 3590 via ESCON channel to our 9672 from inside our 3494
ATL.

I tried to get ADSM to talk to it. I get the message:

       ANR9999D PVRCART(1572): UCB Device Type bytes 3/4 are 80/83, not a
       recognized CARTRIDGE device.